Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c053b3debff08a…

MALICIOUS

PDF

87.8 KB Created: 2021-07-20 06:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f69bd90bb2026c895c47adcf02e79ed SHA-1: 72b085dbe93407c057f6b0104dff8c12a26489aa SHA-256: 39c053b3debff08a303047a0474c9ae60dfc475f86a10b4682f4ec87a9794bf0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, the PDF hosts a link farm pointing to multiple compromised WordPress sites, likely serving as a redirector to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://razaviota.ir/basefile/razaviotair/files/38035204557.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe080f25d5---vixulodonowujovuj.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf19eebd5---sopirapinemuzabaw.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e1523404d4bb44f5d1543500193fce78/defamurowoxagunezuwivap.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd25c4e1f1541860c329b54cfe9c4b4d/rasemufonadifijedemivon.pdf
    • http://degrossier.nl/uploads/file/lomelura.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/e1cef3731e50cff3930f4cd5cdef1f50/36658260964.pdf
    • https://cabsfromheathrow.com/userfiles/file/tijobupemirosagi.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/04971828c0d22fb8eab7ba1300c96f9e/66604094875.pdf
    • https://annjulieskarpmo.com/userfiles/file/17600141075.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/8e7d9dc64e7f4db0a877cade4f01d59a/vevimuzugerativojojafe.pdf
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/legotoxoxipusoxekirom.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd83f553cd.pdf
    • http://azizolace.cz/images/file/tadulawemenitazurow.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b741b07e---jonotawovaniz.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff9a4d5e3d---21580648026.pdf
    • https://drvishweshwari.in/userfiles/file/zedelu.pdf
    • http://tnslib.net/userfiles/files/93144340276.pdf
    • http://anma.pl/anma_edytor/file/banokuzaguxaluxotoku.pdf
    • http://kursadowicz.pl/Upload/file/fetojis.pdf
    • http://studioarclab.eu/userfiles/files/tofutopib.pdf
    • http://ccsctda.com/ckfinder/userfiles/files/20210713_045929.pdf
    • https://ajur.rest/uploads/userfiles/file/20097727137.pdf
    • http://quincy.pl/ckfinder/userfiles/files/tanikaxezuxijunularumal.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=good+fortnite+names+for+clans
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 16792 bytes
font_01_sfnt_off00010bbc.bin
2c6b838df853db9f956a8a7d7b9201cc64649e8ac007304cfcdc10e2fdf53400
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 17464 bytes
font_02_sfnt_off00013981.bin
f23ddfa05d1cced91d9dd4a518e477982dd5b96be5c03c2a25fa83f24b7af4ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x13981 10676 bytes